$wgCookieSetOnAutoblock - (since 1.29) Determines whether to set a cookie when a user is autoblocked. Doing so means that a blocked user, even after logging out and moving to a new IP address, will still be blocked. This is false by default.

HTML

Tidy

Tidy is an open source tool that cleans up broken HTML. You can use this to ensure that broken HTML in articles doesn't affect the layout of your wiki. While Tidy itself is going to be replaced, the configuration settings can still be used for the replacements.

$wgTidyConfig - Configuration of the HTML postprocessing tool to use for fixing invalid HTML code.